Not admitting of moral distinctions or judgments; neither moral nor immoral.(adjective)
Lacking moral sensibility; not caring about right and wrong.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "amoral" in a sentence
"Would-be oppressors have historically recruited whatever argument (s) are at hand to justify atrocity, whether based on the in-group's supposed superiority, the victim's supposed moral failings, supposed divine preferences, or plain amoral arbitrariness."
"That someone who could easily be amoral is portrayed with dimension is fantastic."
"Because, Tremain thought, I'm a mercenary thug who used the word amoral?"